sh.exe": node: command not found

Node is not 'visible' in MINGW32 by default, only in the Windows Command Terminal. Same goes for npm.

How to add it (if you have Node installed), from the official MINGW FAQ:

MSYS uses a Bourne-like shell, hence you can change the PATH using the export command.
The easiest way to add something to the end of the PATH is with the command:

export PATH=$PATH:directory-to-add

So you have to add the directory where Node is installed (probably something like C:\Program Files\nodejs).